<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>文字颜色</title>
  <style>
    h1 {
      background-color: aqua;
      /* color: red; */
      /* color: rgb(0, 255, 0); */
      color: rgba(0, 0, 0, 0.3);
      /* color: #0000ff; */
      /* color: #00f; */
    }
  </style>
</head>
<body>
  <h1>h1 标签</h1>
</body>
</html>